History PlayingWith / CainAndAbelAndSeth

** [[BigBrotherBully Alan]] and [[MiddleChildSyndrome Bob]] are already [[CainAndAbel bitter enemy siblings that hate each other]], but when the {{Outnumbered|Sibling}} AnnoyingYoungerSibling Carla has arrived, [[DespairEventHorizon things go downhill from there]].

* '''Justified''': AnnoyingYoungerSibling Carla only moved into town recently.
Carla is a baby.

** Alan and Bob steals each other's toys, but Carla arrives and steal them all, makIng them berating her for being an AnnoyingYoungerSibling.

** "Alan, we do have grudge against each other, but hey, our sister Carla hates us!"

** At least one additional sibling (either a BigBrotherBully or an AnnoyingYoungerSibling) is introduced to each family in the work, causing a complete and total MindScrew.
** AliceAndBob are revealed to have [[MassivelyNumberedSiblings 120 previously unseen siblings]], who are treated [[RememberTheNewGuy as if they had always been around]]. Some or all of these new siblings reappear later on, greatly complicating Alice and Bob's family situation.

** Alan and Bob steals each other's toys, but Carla arrives and steal them all, makIng them berating her at being an AnnoyingYoungerSibling.

** [[BigBrotherBully Alex]] and [[MiddleChildSyndrome Bob]] are already [[CainAndAbel bitter enemy siblings that hate each other]], but when the {{Outnumbered|Sibling}} AnnoyingYoungerSibling Carla has arrived, [[DespairEventHorizon things go downhill from there]].

** Alex and Bob [[SiblingMurder plan to murder each other]], but their sister [[JerkWithAHeartOfGold Carla]] arrives here to stop it.

** But ending up seeing [[SiblingMurder Bob murdering Alex in a standoff]] and berating Carla for being an AnnoyingYoungerSibling, Carla kills [[BigBrotherBully Bob]] in a RoaringRampageOfRevenge.
* '''Parodied''': Flashbacks are a recurring element in the show, and at first, they only show Alice, Bob, and their parents. After Carla is introduced, she starts appearing in the flashbacks.

* '''Discussed''': "No, we don't have any other siblings. It's just Alice and I. And it's a good thing, too, because she's the only relative I need."

** Alex and Bob [[SiblingMurder plan to murder each other]], but their sister Carla arrives here to stop it.

** [[BigBrotherBully Alex]] and [[MiddleChildSyndrome Bob]] are already [[CainAndAbel bitter enemy siblings that hate each other]], but when the {{Outnumbered|Sibling}} AnnoyingYoungerSibling Carla was born, [[DespairEventHorizon things go downhill from there]].

** But ending up seeing [[SiblingMurder Bob murdering Alex in a standoff]] and berating Carla for being an AnnoyingYoungerSibling, Carla kills [[BigBrotherBully Bob]] in a RoaringRampageofRevenge.

* '''Invoked''': Carla moves to Troperville, knowing that AliceAndBob already live there.

* '''Subverted''': Carla has no effect on Alice and Bob's SiblingTeam dynamic.
* '''Double Subverted''': However, when David and Emily's brother Frank is revealed, the plot falls into chaos.

** At least one additional sibling is introduced to each family in the work, causing a complete and total MindScrew.

** [[BigBrotherBully Alex]] and [[MiddleChildSyndrome Bob]] are already [[CainAndAbel bitter enemy siblings that hate each other]], but when the {{Outnumbered|Sibling}} AnnoyingYoungerSibling Carla was born, things go downhill from there.

* '''Straight''': AliceAndBob are a BrotherSisterTeam. When Carla, an AnnoyingYoungerSibling, is introduced, things get awkward.

** Alex and Bob are already [[CainAndAbel bitter enemy siblings that hate each other]], but when the {{Outnumbered|Sibling}} AnnoyingYoungerSibling Carla was born, things go downhill from there.

** Alex and Bob are already [[CainAndAbel bitter enemy siblings that hate each other]], but when the AnnoyingYoungerSibling Carla was born, things go downhill from there.

* '''Straight''': AliceAndBob are a BrotherSisterTeam. When Carla, a third sibling, is introduced, things get awkward.

* '''Justified''': Carla only moved into town recently.

** AliceAndBob are revealed to have [[MassivelyNumberedSiblings 120 previously unseen siblings]], who are treated [[RememberTheNewGuy as if they had always been around]].